I've got a Carvin X100B amp......bought way back in 1985/86.
I'm the original owner.
Amp is in excellent condition..........looks brand-new despite having played quite a few gigs with it.
I was never, EVER, crazy about the gain channel, and like many of you have been on a quest to add more hair to this amp.
A few years ago I did the trujeque mod......I thought the amp sounded much better........but still needed more gain.
Maybe 2 years ago I had the amp serviced by Fuchs Amplification, less than 2 miles from my home.
Andy Fuchs went through this amp.....complete set of JJ's....bias adjustment.....the works.
He did a great job......the amp sounded fine, but even he said there's only so much that can be done with this circuit.
A few days ago I stumbled onto this forum............had never heard of the BFG mod before.
OK.....possible dumb questions.....but before I grab a soldering iron and explore my amp I want to be sure I understand a few things.
BFG mod - changes gain and tone/feel
C2 - .68uf or 1uf
This means I should replace what is currently there with either of these.......correct?
C5 - lift on leg
C8 - lift 1 leg
This means I should simply de-solder/disconnect 1 leg.....correct?
R3 - change to 100K and parallel with 2000pf
Obvious.....replace R3 with 100k resistor w/2000pf cap in parallel.
C7 - lift leg going towards V2 and insert a 470K resistor with a 470pf cap in parallel
This appears to have been done, but values do not match above suggestions.
R1 - change to 220k
Replace R3 with 220k resistor.
Much thanks to all who reply.
Any advice regarding mods for this amp are greatly appreciated.
msmith40